One big headache is defining the "result" for which payment will be made.

BBC: Businessmen, lawyers and justice

However Ms Grahame said the first part of the bill referring to non-mandatory life sentences was "overly complicated and one big headache".

BBC: Criminal Cases Bill debate 1

And during that time his division was creating one very big legal headache for Citigroup, one that continues to this day.

WSJ: Review & Outlook: Treasury Gets a Citibanker

But even one significant loss can cause a big and expensive headache.

ECONOMIST: Human-rights law